HF vs PLC
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
HF
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The application distributed by Shanghai High-Flying Electronics Technology Co., Ltd is a wireless connection equipment, which is used connect router with company's WIFI modules. It is our own design and development of one-key networking equipment. After using an IOS device to link with a WIFI network, open the application and type the WIFI password in the input box. Then click the 'connect' button in the screen, the application will send the packet with the password information. Right now, the smartlink is in standby state waiting for the connection with the router, and the High-Flying series WIFI module will capture the useful packets. If the password is correctly authenticated, the application will return a feedback of the WIFI moduleβs IP address and MAC address in the screen. If connection fails, the application will feedback with error: smartlink fail,no device is configed. Please check the using details and try again.
PLC
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PLC-Inspector is a professional diagnostic tool for Siemens LOGO! controllers. Read memory, follow changes live and set registers, over Modbus/TCP, directly from iPhone, iPad or Mac. KEY FEATURES β’ Memory reading VM memory, analog inputs (AI) and analog outputs (AQ) of your LOGO! in real time. β’ Register writing Enter values in decimal or hexadecimal and send them to the controller. The app checks what the controller reports back and says so separately when the confirmation does not match the request. β’ Safeguarded writing Write mode has to be switched on deliberately and expires when you leave the view. Before every write there is a confirmation showing register and value in plain text, which can be switched off for a working session. β’ Bit-level visualisation Every register as a 16-bit value with colour-coded bit display. β’ Change detection Changed values are highlighted in orange. Jump between changes with the arrow buttons. β’ Auto-refresh Automatic updates in intervals from 0.5 to 10 seconds. β’ Multiple stations Manage any number of PLC stations with individual settings. APPLICATIONS - Commissioning and fault finding on site - Mobile process monitoring - Analysis of memory contents - Training and education TECHNICAL DETAILS - Protocol: Modbus/TCP (default port 502) - Reading: Read Holding Registers (FC 03), automatic splitting above 125 registers - Writing: Write Single Register (FC 06) with echo verification - Supported controller: Siemens LOGO! 8 (0BA8) NOTE The app needs a network connection to the LOGO! controller. The Modbus server must be enabled in LOGO!Soft Comfort. Developed by spiritdev Softwareentwicklung GmbH - your partner for industrial software solutions.
Screenshots
Verdict
The clearest difference is update cadence: PLC at every 2 weeks against HF's every 17 months. HF's advantage is iOS requirement (12.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
HF ships an update every 17 months, PLC every 2 weeks. The most recent releases landed on September 28, 2026 and October 6, 2026 respectively.
| Parameter | HF | PLC |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 17 months | Every 2 weeks β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, Mac β better |
| Requires iOS | 12.0 β better | 17.0 |
| Further details β not scored | ||
| Size | 4 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Hi-Flying | spiritdev Softwareentwicklung GmbH |
In-app purchases
HF
No in-app purchases
PLC
No in-app purchases









